Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\PluginBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/panels/src/Plugin/PanelsPattern/DefaultPattern.php:16 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/panels/src/Plugin/PanelsPattern/DefaultPattern.php on line 16